Advantages and disadvantages of modern periodic table?

Answer 1

1 The position of Hydrogen is still undecided.

2 Group VIII B consists of three columns instead of one.

3 Like Mendleev's table it fails to accomodate the Lanthanides and Actinides in the main body of table.

4 Some elements which resemble in chemical properties are placed in separate groups like Li in IA and Mg in IIA . They show similarities in properties but are placed in separate groups.

Answer 2

1. He had to make disturbance in the ascending order of atomic weights of sum elements to put them in group that suit their properties.

2. He had to deal with the isotopes of one element are different elements due to the difference in there atomic weight. so, he had to put more than one element in one place (cell) of his table.

Answer 3

Two major disadvantage cited by critics of the left step Periodic Table (LSPT) are as follows:

1) Janet's version III of LSPT displays He next two Be, in the same group with Alkaline Earth Metals. (Version II of LSPT (1928) displays He next to Ne, just like in traditional table);

2) it does not have smooth transition from metals to nonmetals, as traditional Periodic table has. Instead, the sequence of the elements goes from metals to nonmetals and back to metals, ending with alkaline earth metals.

However, Dr. Henry Bent, well known chemist and educator, in his book "New Ideas in Chemistry from fresh energy for the Periodic Law" (Authorhouse, 2006) argues that the above cited disadvantages in fact might be viewed as advantages and that LSPT provides more objective depiction of the Periodic Law. His arguments are based on general regularity of LSPT. Indeed, LSPT's periods are gap less, unlike in traditional periodic table, where first three periods have huge gaps and f-block is presented as footnote. Also, he notes that LSPT follows n+l rule, that is the basis for the Periodic Law. In contrast, the traditional periodic table does not follow the basic rule of the Periodic Law! In addition to those two arguments, he demonstrates that alkaline earths group of elements is distinct form all other groups and, therefore, each period has to end with the alkaline earth metal in order to be gap less.

One of the interesting observations made by prof. Bent is the fact that every other alkaline earth atomic number corresponds to Square Pyramidal number multiplied by factor of four. This is also reinforced by discovery of tetrahedral character of the periodic system made by Jess Tauber in 1979 that was independently rediscovered in 2007 by the author of this note.

Mazurs, in his famous book on Periodic Table formulations, stated that future belongs to a periodic table that would be based on Electron Configurations. I personally believe that LSPT, or its modern offshoot, known as ADOMAH Periodic Table, that closely follows electron configurations and provides convenient method for their derivation, will eventually replace traditional periodic table.

To learn more about it, visist www.perfectperiodictable.com.

Valery Tsimmerman,

Jan 06, 2010.

Answer 4

One of the advantages of the modern periodic table is that it is based on the most fundamental property of an element which is the atomic number. It also displays the similarities and differences in properties of elements in each group. On the other hand, one disadvantage is the position of Hydrogen. The element resembles with the alkali metals and the halogen group. However, it is placed with alkali metals.

Answer 5

Drawbacks of modern periodic table:

1.Hydrogen resembles both the alkali metals and halogens But it has been placed with the alkalis.

2.The lanthanides and actinides have not been placed in the main body of the table.

3.Place of Multivalent elements is not sure in the modern periodic table.

Answer 6

limitation of modern periodic table 1 1.Hydrogen resembles both the alkali metals and halogens. But it has been placed with the alkalis.

2.The lanthanides and actinides have not been placed in the main body of the table.

Answer 7

Hydrogen is not still